What if one of the biggest nutrition mistakes we’re making isn’t what we eat, but what we’re missing?

Dr. Tim Spector is one of the world’s leading researchers on the gut microbiome and how it shapes metabolism, immunity, and even mental wellbeing. In this conversation Tim challenges the conventional nutrition playbook, explaining why calories are a poor guide to health, why most diets backfire, and how ultra‑processed foods can disrupt hunger signals in ways that make “willpower” a losing game.

A central theme in this conversation is that many of us are focused on the wrong problem. Tim argues we’ve been sold a story that we need more protein, when what many people are actually missing is fiber, the essential fuel our gut microbes depend on. From there, the conversation becomes refreshingly actionable, focused on diversity over restriction, whole plants that support microbial health, and why fermented foods can punch far above their weight.

This episode is a grounded, science‑backed reframing of nutrition. It’s less about rules and more about understanding the system inside you, then feeding it well.

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